Davidson Defense Tenacious 10.5-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Upper Build Kit

Tenacious 10.5-inch 1:10 9mm AR-9 Freefloat M-LOK Pistol Upper Build Kit

The Tenacious is a 9mm AR-9 Upper Build Kit built around a compact 10.5-inch direct blowback platform. The kit centers on a 10.5-inch medium profile 4150 CrMoV steel barrel with a nitride finish, 1:10 right-hand twist rate, and 1/2x36 thread pitch, paired with a KAK Industry 9mm mini compensator at 1/2x36 and a black 1/2-inch crush washer. The Vertex Enhanced Pistol Caliber AR-15 billet upper receiver in black is paired with a 10-inch freefloat M-LOK handguard in black featuring a full-length top Picatinny rail and integrated QD mounts. BCG and charging handle are not included.

Key Features

• 10.5-inch medium profile 4150 CrMoV steel barrel, nitride finish, 1:10 right-hand twist, 1/2x36 thread pitch, 9mm
• Direct blowback platform
• KAK Industry 9mm mini compensator, 1/2x36, black 1/2-inch crush washer included
• Vertex Enhanced Pistol Caliber AR-15 billet upper receiver, black
• 10-inch freefloat M-LOK handguard, black, full-length top Picatinny rail, integrated QD mounts
• BCG and charging handle not included

Perfect For

• AR-9 pistol builders sourcing a compact 9mm upper build kit with a Vertex Enhanced Pistol Caliber billet upper receiver, 10.5-inch nitride 4150 CrMoV barrel, KAK Industry 9mm mini compensator, and 10-inch freefloat M-LOK handguard with full-length top Picatinny rail and integrated QD mounts, pairing it with their own AR-9 bolt carrier group and charging handle
• Shooters building a compact 10.5-inch 9mm direct blowback AR-9 pistol platform who prefer to select their own BCG while having the nitride 4150 CrMoV barrel, Vertex Enhanced Pistol Caliber billet upper receiver, KAK Industry mini compensator, and freefloat M-LOK handguard with full-length Picatinny rail covered in one kit
• AR-9 PCC pistol builders who want a 9mm upper build kit with a Vertex Enhanced Pistol Caliber billet upper receiver and a 10-inch freefloat M-LOK handguard with a full-length top Picatinny rail and integrated QD mounts without sourcing components separately

Barrel and Muzzle Device

The 10.5-inch medium profile barrel is chambered in 9mm and constructed from 4150 CrMoV steel with a nitride finish. The twist rate is 1:10 right-hand and the thread pitch is 1/2x36, which matches the included KAK Industry 9mm mini compensator. A black 1/2-inch crush washer is included. The direct blowback platform design addresses the 9mm cartridge in an AR-9 pistol caliber build without a gas system.

Upper Receiver and Handguard

The Vertex Enhanced Pistol Caliber AR-15 billet upper receiver carries a black finish and is designed around the AR-9 pistol caliber platform. The 10-inch freefloat M-LOK handguard is black with a full-length top Picatinny rail, integrated QD mounts, and M-LOK attachment points along the body for accessory mounting. These two components define the exterior structure of the upper assembly on this AR-9 pistol platform.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included. Verify compatibility with your specific 9mm AR-9 lower receiver and magazine pattern before use.